When confronted about others posts he had made about the Queen - one calling her a "leech" - Mr Mills said they "just demonstrate the passion I feel about helping the vulnerable and highlighting the wealth disparity".

Another group looking to hijack the day in Windsor is run by Kunal Singhal, who urged attendees on the day to dress down in solidarity with the homeless.

George Barda, another organiser, was approached by reporters to discuss his views. However after opening the door wearing just his underwear, he said he could not talk because he was meditating.

He later said: "Homelessness is a terrible scourge and drawing attention to it is important."

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